I think he used inferior like organs that worked like the SM organs other then the black carparse. From a secondary heart, reinforced bones, Muscle growth, can enter hibernation for a time, learn by eating etc. I just can't grasp how humans can basically have the same organs as SM just in a far less efficient form. If they add this? Why in the hell is this not standard for all IG? Can't be that expensive compared to making warships that are hive cities with massive guns.
On a side, people at my GW Store love making interesting or in this site tongue, Hersey type armies from SM allied with the Tau(Seriously WTF) to Slannesh Deamonettes serving Knorne. Normally I don't think it's a big deal but some of those that come through that door, sometimes your jaw will just drop and go WTF?